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63 lines
1.5 KiB
63 lines
1.5 KiB
/*
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* Copyright (c) 2016-2019, ARM Limited and Contributors. All rights reserved.
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* Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <assert.h>
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#include <arch_features.h>
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#include <arch_helpers.h>
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#include <common/bl_common.h>
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#include <common/debug.h>
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#include <drivers/delay_timer.h>
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#include <drivers/generic_delay_timer.h>
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#include <lib/utils_def.h>
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#include <plat/common/platform.h>
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static timer_ops_t ops;
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static uint32_t get_timer_value(void)
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{
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/*
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* Generic delay timer implementation expects the timer to be a down
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* counter. We apply bitwise NOT operator to the tick values returned
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* by read_cntpct_el0() to simulate the down counter. The value is
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* clipped from 64 to 32 bits.
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*/
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return (uint32_t)(~read_cntpct_el0());
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}
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void generic_delay_timer_init_args(uint32_t mult, uint32_t div)
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{
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ops.get_timer_value = get_timer_value;
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ops.clk_mult = mult;
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ops.clk_div = div;
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timer_init(&ops);
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VERBOSE("Generic delay timer configured with mult=%u and div=%u\n",
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mult, div);
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}
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void generic_delay_timer_init(void)
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{
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assert(is_armv7_gentimer_present());
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/* Value in ticks */
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unsigned int mult = MHZ_TICKS_PER_SEC;
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/* Value in ticks per second (Hz) */
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unsigned int div = plat_get_syscnt_freq2();
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/* Reduce multiplier and divider by dividing them repeatedly by 10 */
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while (((mult % 10U) == 0U) && ((div % 10U) == 0U)) {
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mult /= 10U;
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div /= 10U;
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}
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generic_delay_timer_init_args(mult, div);
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}
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